feat: Custom session ID with agent engine

[guillaumeblaquiere]

For out of scope file, I ran autoformat.sh on the whole project

Up to recently, Agent Engine session management API did not accept custom session-id. it was always generated by Agent Engine

Problem:

• It was possible to create custom session ID with database session service and in memory session service, but not with vertexAiSessionService
• A2A created session with the taskId as sessionID. The A2A processing fails when VertexAiSessionService is in use (because custom session (taskId) is not supported) => Issue A2A with agent engine session service in api_server runtime #3458

Solution:
Now, the API accept custom sessions, with a query parameter
https://docs.cloud.google.com/vertex-ai/generative-ai/docs/reference/rest/v1/projects.locations.reasoningEngines.sessions/create

But the VertexAISessionService wasn't up to date with this change.

I updated it

Additional info

The API returns a strange return code about LR0 definition, and request only LONG as session ID. But, even if you use string, it works well.

So, I catch the "strange" error, log it, but no longer block the processing.

Testing plan

VertexAISessionService Creation with custom session ID and the simulation of 400 HTTP return code with the message "Since the idType "sessions" is not a documented LRO Parent ID..."

[adk-bot]

Response from ADK Triaging Agent

Hello @guillaumeblaquiere, thank you for your contribution!

Could you please add a testing plan section to your PR description to describe how you tested these changes? This will help reviewers to understand and verify your changes more efficiently. Thanks!

[rohityan]

Hi @guillaumeblaquiere , Thank you for your contribution! We appreciate you taking the time to submit this pull request. Can you please fix the failing unit test and formatting errors

[guillaumeblaquiere]

@rohityan I didn't find tests related to my updates, only A2A tests fail on my computer (python 3.12).

Can you tell me how to run test on GitHub to verify myself the conformity before annoying you?

[rohityan]

Hi @guillaumeblaquiere , they pass now, can you also fix the formatting error.

[guillaumeblaquiere]

@rohityan, I ran the autoformat.sh script and, 2 files, again out of my scopes has been updated.

No worries, but my PR shouldn't be slowed because of that side issues.

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reformatted tests/unittests/integrations/agent_registry/test_agent_registry.py

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